What about "The Antipodes"?
Theoretically, there is no collective name for the two countries. They both fall within the general region of Oceania, as do several small pacific nations and islands.
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answer 2 firstly, as to the question, Australasiais a common collective name for these two countries. And indeed the broader region is Oceania.
Antipodes is the generic name for "what is opposite on the globe to ... ", and you could have the antipodes to Moscow, or Washington etc. Because of historic colonial traditions, there is a place called 'Antipodes Island' - about the antipodes of Britain.
Oceania is the official collective name for Australia, New Zealand and surrounding Islands of the South Western Pacific
Tasmania
No. An early name for Australia was New Holland. It is thought that the name New Zealand may have been a reference to this as both Holland and Zealand (Zeeland) are parts of what is now called the Netherlands.
The New Zealand Warriors is the name of the New Zealand Rugby League team that plays in Australia's NRL competition.
Australia and New Zealand are separated by the Tasman Sea
Yes, New Zealand is a country situated southeast of Australia.
New Zealand & Australia
The Tasman Sea is the name of the stretch of ocean between Australia and New Zealand.
The name given collectively to Australia, New Zealand and surrounding islands is Oceania. It is not considered a continent but instead is a region or the world.
Australia never changed its name to Oceania. Oceania refers to Australia, New Zealand and surroundings.
The name of water in between New Zealand and Australia is the Tasman Sea.
New Zealand is the island nation southeast of Australia.